Internal-combustion engine



' 4 1,660,859 E. R. BURTNETT l V INTERNALA COMBUSTION ENGINE Filed Jan.15, 1925 lang'. l

Patented Feb. 28 1928.

UNITED "STATES ATENT OFFICE.

IEVl-lllzt'lf'`V RBUR'INETT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BYDIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMOTIVE VALVES CO., OF LOSANGELES, CALL FORNIA, n `vor.,UNaaRY TRUST.

INTERNAL-COMBUSTION ENGINE.

Application filed January 15,1925. Serial No. 2,527.

` the pumping chambers of the two dialneter bore cylinders and thetransfer inlet ports into the combustion chambers and, in order that theflow of gaseous fuel through the ducts may he uniform and subjected tothe same surface friction, I propose to make the three ducts equal inlength and substantially equal in cross sectional area.

lVith the foregoing and other objects in view, my invention consists incertain novel features of construction and arrangement of parts thatwill be hereinafter more fully described and claimed and illustrated inthe accompanying drawingsin which:

Fig. 1 is a plan view of a six` cylinder engine equipped with gaseousfuel transfer ducts of my improved construction and with parts of saidengine and ducts in horizontal section. i y

Fig. 2 is a side elevational view of an engine equipped with thetransfer ducts and with parts of said engine in vertical. section.

Fig. 3 is a diagrammatic View that graphically represents thearrangement and relative lengths of the transfer ducts.

Referring by numerals to the accompanying drawings, 10 designates acylinder block having siX combustion chambers 11, 12, 13,

14 15 and 16, the axes thereof being parallel and in the same plane, y

The chambers 11, 13 and 15 have uniform diameters throughout theirlengths, While the lower vportions of chambers 12, 14 and 16 areincreased in diameter to form gascous fuel pumping chambers 17,18 and 19respectively. i

Pistons such as 2() having straight diameters are arranged for operationwithin `combustion chambers 11, 13 and 154 and the smaller portions oftwo diameter pistons,

such as 21 are arranged for operation within chamber-S12, 14 :111516.

The larger portions 22 at the lower ends of pistons 21 operate withinthe pumping chambersl'l, 18 and 19. i

Located on the side of cylinder block 10 and leading from pumpingchamber 19 to transfer inlet ports that communicate with combustionchamber 12 is a gaseous fuel transfer duct l23.

Leading from pumping chamber 17 to transfer inlet ports that communicatewith combustion chamber 14 is a gaseous fuel transfer duct 24 and asimilar' gaseous fuel transfer duct 25 leads from pumping chamber 18 totransfer inlet ports that communicate directly with combustion chamber16.

The three gaseous fuel transfer ducts thus constructed and arranged, areequal in length, andas a result, `the gaseous fuel charges pumped fromthe chambers 17, 18 and 19 into the respective chambers 14, 16 and 12travel equal distances, thereby insuring uniform volume flow and thisdesirable effect is enhanced by making the ducts practically the same incross sectional area, so` as to secure uniformity of the surfacefriction that is produced by the gaseous fuel flow through said ducts.

Obviously, the construction of the gaseous `fueltransfer ductsas hereindescribed, may' be modified in certain minor details without departingfrom the spirit of the invention, the scope of which is set forth in theappended claims. y

The lineal lengths of the three ducts are the same due to the extensionof ducts 24 and 25 outward to a plane further away from the body of theengine than the duct 23. y

I claim as my invention:

1. The combination with an internal combustion engine having sixcylinders, in each of which is formed a combustion chamber and therebeing charge pumping chambers formed in three of said cylinders, ofthree fresh charge transfer ducts leading respectively from the threepumping chambers of the engine to three ot the combustion chambers, eachof the three transfer ducts having the same crosssectional areathroughout its entire length, the three ductsv having the same totallinealL length and said three transter duets having the same cubiccontent capacity. p

2. In an internal combustion engine having three combustion chambers andthree charge pumping chambers, the six cylinders being disposed in astraight roW IWith their axes occupying the same plane, three freshcharge transfer ducts each being arranged between a chargepumpingchamber and a combustion chamber of the engine, the lineal length of thethree ducts being equal, said three ducts having the same crosssectional area throughout their lengths, the turns in said threetransfer ducts being identical in form, angle and percentage of turn,the intermal area of the three ducts being identical, and said threeducts being all located on the same side of the roW of six cylinders.

3. In an internal combustion engine having three charge pumping chambersand three combustion chambers, said siX cylinders being arranged in astraight roW with their axes occupying the same plane, three Vchargetransfer ducts, each providing com-

